No reason to feel that you "should know this stuff." We're all here to be a supportive community and help each other out as best we can.
I know I didn't use a download folder, but placed the Zip file (media creation) on the desktop main window and unzipped it there. Then renamed the folder that had the script in it to "Windows11ARMISO" and left it there only Windows desktop. Then I ran that script with a right-click and run within the Windows VM and all compiled right through to the ISO, though it took quite a while for this to happen. My file in the end was called 22000.194.210913-0150.CO_RELEASE_SVC_PROF1_CLIENTPRO_OEMRET_A64FRE_EN-US.ISO finishing up at about 6.3 GB in size. I then dragged the file from the VM folder onto the Mac Desktop. From there I could copy to a Flash drive, but only one that was NTFS formatted (I happened to have a 256GB Sandisk handy).
This was the first step I did for archiving the file. I also put it on the 1TB MS OneDrive. The tricky part after this is that you cannot run that ISO from the drive to install. You MUST follow the steps to make a bootable flash drive with the Tom's Guide instructions because the install will only recognize FAT32 for booting ("How to clean install Windows 11: Create a bootable Install Disk" section of
https://www.tomsguide.com/how-to/how-to-do-a-clean-install-of-windows-11 ). You'll need to partition a clean/fresh/new flashdrive as both FAT32 (1 GB) and the remaining part as NTFS for the remaining part of the drive. There are 6 steps to follow for this.
When you get done here and get to the next section "How to clean install Windows 11: Perform the clean install" you will be asked in step 4 "You many not enter your Windows product Key." The instructions specifically state there "If you have your license key for Windows 10 at hand, type it in, but if not don't worry: you can just click "I don't have a product key" to continue."
You will want to do all of these steps from within your existing Windows 11 ARM install.
I think this should work to finish the install. Let me know how this goes.
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